21515912992 has 48 divisors (see below), whose sum is σ = 48909934080. Its totient is φ = 9126033408.

The previous prime is 21515912983. The next prime is 21515913007. The reversal of 21515912992 is 29921951512.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473392 + ... + 516847.

It is an arithmetic number, because the mean of its divisors is an integer number (1018956960).

Almost surely, 2^21515912992 is an apocalyptic number.

It is an amenable number.

21515912992 is an abundant number, since it is smaller than the sum of its proper divisors (27394021088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21515912992 is an equidigital number, since it uses as much as digits as its factorization.

21515912992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990353 (or 990345 counting only the distinct ones).

The product of its digits is 145800, while the sum is 46.

The spelling of 21515912992 in words is "twenty-one billion, five hundred fifteen million, nine hundred twelve thousand, nine hundred ninety-two".